Picture hanging screw



FIG. 1 is a perspective view of a picture hanging screw showing my design;

FIG. 2 is a left side elevational view; where the right side elevational view is a mirror image thereof;

FIG. 3 is a top plan view; and,

FIG. 4 is a bottom plan view.

The broken lines in the drawings illustrate portions of the picture hanging screw and form no part of the claimed design. 

CLAIM The ornamental design for a picture hanging screw, as shown and described. 